Caren van Roekel

123 One-day treatment in 166 Ho-radioembolization Study records were reviewed to assess clinical adverse events that occurred during the treatment day. Adverse events were scored according to the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 (11). Technical success rate was defined as the number of patients scheduled to undergo one-day treatment with radioembolization who completed treatment. Findings that prevented continuation of treatment were identified. In the HEPAR I and II studies, patients underwent a double work-up procedure with both administration of 99m Tc-MAA and 166 Ho-scout to confirm the accuracy and safety of 166 Ho-scout (Figure 1). Findings encountered during or after the first simulation procedure using 99m Tc-MAA were also regarded as prohibiting one-day treatment, because they were likely to have happened with 166 Ho- scout as well. 4